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Creamy Crockpot Scalloped Potatoes with Onions

Crockpot scalloped potatoes with onions cook in a creamy sauce until tender and easy to pierce. Thinly sliced Yukon gold potatoes are layered with onions and a rich, gently simmered cream sauce for a cozy slow cooker side dish.
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Prep Time 20 minutes
Cook Time 6 hours 5 minutes
Resting time 15 minutes
Total Time 6 hours 40 minutes
Servings: 8 servings
Course: Side Dish
Cuisine: American
Calories: 500
Ingredients Equipment Method Notes

Ingredients
  

For the potatoes
  • 1 cooking spray for coating
  • 3 lb Yukon gold potatoes peeled and sliced 1/8 inch thick
  • 2 yellow onions medium, thinly sliced
For the cream sauce
  • 4 tbsp unsalted butter
  • 0.25 cup all-purpose flour
  • 2 cup whole milk
  • 1 cup heavy cream
  • 1.25 tsp kosher salt
  • 0.5 tsp black pepper
  • 0.125 tsp ground nutmeg

Equipment

  • 1 6-quart slow cooker

Method
 

Prepare the potatoes
  1. Coat the inside of a 6-quart slow cooker with cooking spray.
  2. Peel and slice the potatoes 1/8 inch thick, then thinly slice the onions.
Make the cream sauce
  1. Melt the butter in a medium saucepan over medium heat.
  2. Whisk in the flour and cook for 1 minute.
  3. Gradually whisk in the milk and heavy cream, then bring the mixture to a gentle simmer.
  4. Whisk for 3 to 5 minutes, until thick enough to coat the back of a spoon.
  5. Whisk the salt, pepper, and nutmeg into the sauce.
Layer and cook
  1. Arrange one-third of the potatoes in the slow cooker, top with one-third of the onions, and spoon over one-third of the sauce; repeat twice, ending with sauce.
  2. Cover and cook on LOW for 5 to 6 hours or HIGH for 3 to 4 hours, until the potatoes are easily pierced with a knife.
  3. Turn off the slow cooker and remove the lid.
  4. Let the potatoes rest for 15 minutes before serving.

Notes

For the smoothest sauce, add the milk and heavy cream gradually while whisking. Refrigerate leftovers for up to 4 days; freezing is not recommended because the cream sauce may separate. For a lighter option, replace the heavy cream with additional whole milk.